Welcome to HCM
Greetings of day.
It would have useful if you could mention age of baby, as the cause of vomiting
could be more obvious. Going by your statement of introducing another feed means that the baby s weaning feeeds , may be the baby is around 4-5 months old. In that case keep feeding the baby with spoon and consult a Pediatrician
. It would be very kind of you if you could mention the age .